Well....depreciation wise I lost the same amount on the TT over nearly 18 months as I did on my 4/4 over 2 1/2 years. I agree with Phillip, the non depreciating Morgan (well modern ones) is a myth.
The second day in of ownership of the Z4 is interesting. The M Sport suspension with 19"wheels and run flats to boot...is better than the TT ride, much to my surprise! Z4's are not to everyones taste....but whilst I'd choose a Boxster as the ideal, the cars parked outside and I'm not keen on a fabric hood in those circumstances. Perhaps I should have sold the Roadster to free up garage space? !! My days of driving fast enough to require a "true" sport car are past and the Zed does all that I need of it; it'll be my third one over the years so I guess they suit me!